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G.Majumder: Status and perspectives of India based neutrino observatory, INO

March 4, 2015

The aim of the INO collaboration is to create an experimental facility in the country where they can carry out neutrino experiments. The collaboration is fully from Indian institutes at the moment.

The detector is a iron calorimeter with charge identification capability. It can provide improved measurement of oscillation parameters and can help determine the neutrino mass hierarchy, among other things.

The detector is completely different from others. It uses 4cm thick iron plates with 5.6 cm gaps filled with gas and float glass with readout strips in x and y, with 5mm position resolution, inside a 1.3T magnetic field. The bending of muons is crucial for the determination of the mass hierarchy of neutrinos.

The total number of RPCs in the detector is 28,800, with a ttoal gas volume of 200 cubic meters, for a total surface area of 10^5 square meters. The RPCs in streamer mode suffer efficiency losses after some time of operation, so they will work in avalanche mode.

The construction requires the building of a proper infrastructure, which does not exist in the remote site where the detector will be located. This is underway – even a proper road needs to be constructed.


A prototype of 35Tons has been built (see figure above). It will give long-term operational experience and allow to test the electronics.

A sketch of the underground facility is shown below. The overburden is of 1485 meters under the top of the mount at Bodihills.


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